Difference between pi(2^n) and the integer nearest to 2^n / log(2^n).

Terms

a(0) =-2a(1) =-1a(2) =0a(3) =0a(4) =2a(5) =3a(6) =5a(7) =8a(8) =15a(9) =24a(10) =40a(11) =72a(12) =119a(13) =212a(14) =360a(15) =633a(16) =1128a(17) =1989a(18) =3580a(19) =6386a(20) =11537a(21) =20897a(22) =37980a(23) =69354a(24) =127336a(25) =234054a(26) =431877a(27) =799754a(28) =1484440a(29) =2763961